watchful

  • (a) engaged in or accustomed to close observation
    • caught by a couple of alert cops
    • alert enough to spot the opportunity when it came
    • constantly alert and vigilant, like a sentinel on duty
    alert,
  • (s) experiencing or accompanied by sleeplessness
    • insomniac old people
    • insomniac nights
    • lay sleepless all night
    • "twenty watchful, weary, tedious nights"- Shakespeare
    insomniac, sleepless,

Synonyms

alert insomniac sleepless

Antonyms

unalert unvigilant unwatchful

See also

awake lively wary

Words of close approximity

watchfully watchfulness